I'm certainly familiar with the first two. We used to go to some country folk festivals here for a while and Big Rock Candy Mountain was always covered. And Guthrie was one of the records Dad had (amongst a plethora of others of course). I do love that old world folk.
Here's a tune that comes to mind when I think of those festivals.
I'll try to come bacck and listen to the third one - I'm in class supervising at the moment so I can't listen right now!
It's a unique sound isn't it? Not quite like anything else. And the social commentary is always there too, of course.
That's a great song you posted!